elm_panel : Fix bug with set scrollable panel orient.

elm_panel : Fix bug with set scrollable panel orient.

Summary:
1. Fix wrong logic of ELM_PANEL_ORIENT_RIGHT case in _state_sync.
2. Move pre calc function in anim_cb to sizing_eval function.
   This code have caused problem that scrollable panel is not animated during drawer open and close.
3. Maintain content size ratio when orient is changed.
4. Freeze scroller when orient is changed.
   This code will need to change orientation when drawer opened.

Reviewers: cedric, eunue

Subscribers: cedric, jpeg

Differential Revision: https://phab.enlightenment.org/D4320